Update deps for security vulnerabilities and remove Django warning.

Author: Dennis Schwartz

main/models.py

@@ -23,7 +23,7 @@ class Component(models.Model):
     downloads = models.BigIntegerField(default=0, null=True)
     created_time = models.DateTimeField(null=True)
     modified_time = models.DateTimeField(null=True)
-    tags = models.ManyToManyField('Tag', null=True)
+    tags = models.ManyToManyField('Tag')
     icon_url = models.URLField(null=True, blank=True)
     icon = models.ImageField(null=True, upload_to='icons/')
     github_url = models.URLField(null=True)

requirements.txt

@@ -1,6 +1,6 @@
 certifi
 chardet==3.0.4
-Django==1.11.13
+django==1.11.15
 django-redis==4.9.0
 django-rest-framework==0.1.0
 djangorestframework==3.8.2
@@ -9,6 +9,6 @@ numpy==1.14.5
 Pillow==5.1.0
 pytz==2018.4
 redis==2.10.6
-requests==2.18.4
+requests==2.20.0
 urllib3==1.22
 django-cors-headers==2.4.0